Recent content by photobillyli

Thanks for yours explanation! Thank you!

Thanks for OlderDan's detailed explanation. Let me to answer my question. There are always irregularities between the surfaces. The peaks of one surface will fit into the valleys of the other surface. A larger applied force is needed to starts the body's motion. On the other hand, when the...

I have done an experiment to study the relationship between the static friction and kinetic friction of a wooden block. I have found that the static one was larger than the kinetic one. My textbook also tells me that result. However, that web tells me that there should be no any difference...

Thanks! Can you tell me more about that?

Why is the kinetic friction always smaller than the limiting static friction? Thank you very much!